Lantern slide clamp



-March 17, 1942. F. D'. MILLER LANTERN SLIDE CLAMP 2 Sheets-Sheet 1 Filed Oct. 4, 1941 2 717517 l MILL-E llforuey March 17, 1942. MILLER 2,276,735

. LANTERN SLIDE CLAMP Filed Oct. 4, 1941 2 Sheets-Sheet 2 I m'en for m 2 7%]; D.M/LLE/? A III/rue Patented Mar. 17, 1942 LANTERN SLIDE CLAMP Fred Duffield Miller, Altoona, Pa.

Application October 4, 1941, Serial No. 413,671 2 Claims. (01. 88-26) The present invention relates to new and useful improvements in slide clamps for projecting lanterns and has for its primary object to pro-- vide, in a manner as hereinafter set forth, novel means for holding a plurality or series of slides for facilitating the showing thereof.

Another very important object of the invention is to provide a lantern slide clamp of the aforementioned character comprising unique means for centering or framing the slide being projected.

Other objects of the invention are to provide a lantern slide clamp of the character described- Which will be comparatively simple in construction, strong, durable, highly efiicient and reliable in use, compact, light in weight and which may be manufactured at low cost.

All of the foregoing and still further objects and advantages of the invention will become apparent from a study of the following specificaticn, taken in connection with the accompanying drawings wherein like characters of reference designate corresponding parts throughout the several views, and wherein:

Figure l is a perspective view, showing an embodiment of the present invention in use.

Figure 2 is a view in front elevation of the device.

Figure 3 is an end elevational view.

Figure 4 is a vertical sectional view through the holder, taken substantially on the line 4 --4 of Figure 3.

Referring now to the drawings in detail, it will be seen that the embodiment of the invention which has been illustrated comprises substantially channel-shaped, opposed upper and lower bars I and 2, respectively, of resilient metal or other suitable material. The channel bars I and 2 are adapted to receive therebetween a series of lantern slides 3. The flanges 4 of the bars I and 2 are inwardly bowed in a manner to frictionally grip the sides of the lantern slides 33. The web of the upper bar I has formed transversely therein at longitudinally spaced points grooves or channels 5 the purpose of which will be presently set forth.

Mounted on a conventional projecting lantern 6 is a holder which is designated generally by the reference numeral I. The holder 1 comprises a plate 8 having an aperture 9 therein. Onthe upper and lower edges of the plate 8 are integral guide flanges III of angular cross section which are adapted to slidably receive the bars I and 2' with the slides 3 therein.

The upper guide ID has pressed downwardly therein a transversely extending rib or detent II which is engageable in the grooves or depressions 5 in the upper bar I,

Mounted on the lower guide I!) is a bowed spring I2 on which the bar 2 rides and which is maintained under tension thereby. The spring I2 terminates in downturned end portions I3 which are engaged with the ends of the lower guide II] for securing said spring against longitudinal movement in the holder '1.

It is thought that the operation of the device will be readily apparent from a consideration of the foregoing. Briefly, the spring I2 yieldingly urges the bar I upwardly against the upper guide I0. The detent II is located above the vertical center of the light aperture 9 in the plate 8. A groove or channel 5 is provided in the bar I for each of the lantern slides '3 above the vertical center thereof. As the bars I and 2 are moved through the holder I the slides 3 are brought into registry with the light aperture 9. When the correct position is reached the detent II is engaged in the adjacent groove or channel 5 for releasably holding and centering the slide being shown. Of course, to shift the slides it is only necessary to exert sufficient force to overcome the tension of the spring I2. The clamping bars I and 2 may be used to support a series of slides in any suitable mount other than the holder 1, as, for example, when it is desired to view said slides without projecting them on a screen.

It is believed that the many advantages of a lantern slide clamp constructed in accordance with the present invention will be readily understood, and although a preferred embodiment of the device is as illustrated and described, it is to be understod that changes in the details of construction and in the combination and arrangement of parts may be resorted to which will fall within the scope of the invention as claimed.

What is claimed is:

1. A lantern slide clamp comprising a holde including a plate having a light aperture therein,

angular guide flanges on the upper and lower ends of said plate, a pair of opposed channel bars, for the reception of a series of slides, operable in the holder and slidable on said guides, resilient means on one of the guides for yieldingly urging one of the bars against the other guide, and coacting means on said one bar and on said other guide for releasably securing the slides in adjusted position in the holder, the lastnamed means including a transverse detent on said other guide, said one bar having a series of transverse grooves therein at longitudinally spaced points for the reception of said detent.

2. A lantern slide clamp of the character described comprising a plate having a light aperture therein, guides of angular cross section said channel bars being inwardly bowed for en- 10 gaging and frictionally gripping the sides of the slides, one of the bars having a plurality of transversely extending grooves at longitudinally spaced points in its web portion, a detent on one of the guides engageable in the grooves for re leasably securing the slides in adjusted .position in the holder, and a bowed spring mounted on the other guide and engaged with the other bar for yieldingly urging said one bar against said one guide, said spring including downturned end portions engaged with said other guide for retaining said spring against longitudinal movement thereon.

FRED D. MILLER. 

